Senior Application Developer

  • Prexel LLC
  • Harrisburg, Pennsylvania
  • Full Time

The candidate should have all the following requirements:

  • IT expertise in the development and support of large, complex, mission-critical enterprise software systems
  • Provide a highly stable and supportable environment, improving all aspects of the Enterprise system
  • Provide ongoing assessment of the operational state of the network, compute, and security operations, and drive continuous improvements
  • Continuously evaluate the evolving needs of the Enterprise systems and ensure sufficient capacity is planned and in place to meet the needs of the agencies and customers
  • Lead the identification and mitigation of risks, troubleshoot, and provide resolution to complex end-to-end scenarios involving multiple external agencies, products, protocols, networks and technology stacks
  • Develop and document standards, policies, processes, roles, and responsibilities to support the operations
  • XML Schema Mastery: Expert-level proficiency in XSD (XML Schema Definition), including the ability to navigate and extend the NIEM core and individual justice domain schema
  • Transformation Logic: Extensive experience with XSLT 2.0/3.0 and XPath for mapping legacy GJXDM elements to their corresponding NIEM components
  • Tooling Proficiency: Hands-on experience with NIEM-specific tools, such as the Altova XMLSpy for schema management
  • Maintain and enhance documentation of architecture, infrastructure, and system troubleshooting methods
  • Develop, measure, and maintain KPI s for the core network, compute, and security operations and supporting reports, dashboards, and executive summaries
  • Unique combination of expertise in Solution Management applications
  • Understanding of OO concepts and design patterns
  • Good understanding of TFS, build and deployment process
  • Problem solving and critical thinking
  • Must be able to work independently
  • Can communicate effectively with multiple team members at a given time
  • Strong team-building, vendor and customer relations skills

Required skills and Experience

  • Required: 4 Year college degree
  • Required: .NET Framework (1.1 4.6.x) 5 years
  • Required: .NET Core 2 years
  • Required: ASP.NET 5 years
  • Required: After-hours support
  • Required: C# 5 years
  • Required: WCF Web Services 5 years
  • Required: Object Oriented Development 5 years
  • Required: Web API 2+ year
  • Required: MS SQL Server 5 years
  • Required: Visual Studio 5 years
  • Required: IEPD Lifecycle Management: Proven track record of developing and documenting IEPD according to the NIEM specification 3 years
  • Required: ESB Migration: Experience refactoring custom client interfaces and web services (SOAP/REST) to consume NIEM-conformant messages without breaking downstream legacy consumers 3 years
  • Namespace Management: Ability to manage XML namespaces and versioning strategies to ensure backward compatibility during a multi-phased migration 3 years
  • Required: Broad experience in software development including coding, testing, deployment and maintenance of applications developed on Microsoft stack - 6 years
  • Required: Experience maintaining and extending technical documentation 5 years
  • Required: Understanding and working experience with Microsoft SQL Server 5 years

NICE TO HAVE: Experience with Azure

Job ID: 522815644
Originally Posted on: 5/29/2026

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